Gear.



i CLW A. B. CADMAN.

GEAR.

APPLIOATION FILED AUG. 10, 1911.

1,015,870. Patented Jan. 30, 1912.

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v I n u m W( %a ADDI BENJAMIN CADMAN,^0F IBELOIT, WISCONSIN, .ASSIGNOB. TO WARNER. INSTRU- MENT COMPANY, or BELOIT, wIsooNsIN, A conronA'rIoN OF ILLIivoIs.

GEA'R.

Specification of Letters Patent.

Patented Jan. 30, 1912.

Application filed August 10, 1911. Serial No. 643373. i

To all whom it may concem:

Be it known that I, ADDI BENJAMIN Can- MAN, a citizen of the United States, residng at Beloit, county of Rock, State of lVsconsin, have made a new and useful Invention in Gears, of which th'e following is a specification.

This invention relates to gears, and particularly to gears employed in connecton with the drive mechanisn of speed'indicating instruments.

The object of the invention is to provide means for preventing gears from chattering or rattling when intermeshed and Operating in geared relat-ion with other gears.

Other objects of the invention will appear i more flly hereinafter.

The invention consists substantially in the Construction, combination, location and relative arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawing, and finally pointed out in the appended claims.

In the accompanying drawing,-Figure 1 is a view in side elevaton, parts broken out, and parts in section, showing intermeshed gears one of them embodying'the principles of my invention. Fig. 2 is a View in section on the line 2-2 Fg. 1 looking in the direction of the arrows. Fig. 3 is a fragmentary view in side elevation of a portion of a gear showing the application thereto of devices embodying my invention. Fig. 4: is a broken View in section showing a slightly modified form of retaining device for the antichattering member. i i

In the Patent Number 840977, granted January 8th, 1907, to Arthur P; Warner and Addi Benjamin Cadman, is set forth described and claimed a gear having its peripheral portion bent to form an open channel, the bent portion, forming the bottom and side walls of the channel, being kerfed or cut transversely through to form gear teeth. In the use of the gears, embodyng the Construction referredto, it has been found that the intermeshing of the gears, particularly when driven at high speeds, produces a rattling or ch'attering and hence an objectionable noise.

It is among the special purposes of my invention to provide means for deadening the' chatter and noise and to eliminate this objectionable feature in intermeshing gears generally. and particularly in gears of the Construction set forth, described and claimed V in the patent referred to.

In accordance with the principles of my' invention I form or provide the gear with a circumferential channel or groove at the base of its teeth, or in such proximity thereto' as to communicate with the spaces between adjacent teeth. In the particular Construction shown the overturned periplin intermeshed relation, from chattering.

In the drawing 5-6 designate intermeshing gears one of them being formed from a body-part having its peripheral portion 7 bent over to form a substantially U-shaped channel. The teeth 8, of the gear are formedby cutting transverse grooves 9, across and through the bent over portion 7, the trans- Verse cuts or kerfs extending through the base or bottom wall of the channel, as more fully described and claimed in the patent above referred to. It is 'obvious that the channel or groove may be formed in any other suitable or convenient manner. In accordance with my present invention, I place within the channel a yielding resilient or other suitable body 10 and arrange the same to normally bear against the base or.

bottom wall surface of thechannel so as to eXtend into the spaces between the teeth.

In practice I have found that a leather ring will well answer the purpose but my invention is not to be limited in this respect.

If desired and in order to efliciently retain the body 10 in place within the channel,

I employ a suitable spring 11, which may be of any suitable structure or arrangenent. In the form shown in Fig. 2 the retaining device 11, is in the form of a band split to form a ring. A wire ring 11, see Fig. 4, may well answer the purpose.

In the operation of intermeshing gears enbodying the Construction above described when the teeth of one gear enter the spaces to travel in the channel in which it is 9', of the 'other,'the end -srrfaces 'of the gear teeth engage and press against the yielding body 10, which serves to take up any slack and to maintain a desirable tension upon the gears to prevent the teeth thereof from chattering or pounding against each other while the gears are being driven in intermeshed relation. s

It may sometimes occur that the yielding body 10, may creep around the gear, that'is,

placed, and at a difl'erent s eed from that of the gear, with the result t at the split ends of the yielding body, as indicated at 12, may eventually be brought opposite the ends of thesplit retaining device 11, 18, so that a depression of one or the other of the ends of.

the yielding body at this point will cause thesame to be depressed relatively to one end or the other of the, retaining device, thereby causing the ends .of the retaining deviceto lap upon or past each other and consequently to eventually be forced out of retainng relation. To prevent this result I propose to bend or defiect the ends of the retaining device as indicated at 13, to a suflicient extent to prevent the one end from- This relative overriding upon the other. creep of the yielding body within the channel of the gear is advantageous in that thereby wear on the yielding device by reason of the engagement therewith of the teeth of the intermeshed gear is greatly reduced.

Having now set forth the objects and na-' ture of my invention and a Construction embodying the principles 'thereofl what l claim in said bent portion, of a yielding body mounted in said channel to take the hearing contact of the end surfaces of the teeth of an intermeshing gear and means for retaining said yielding body within said channel.

3. A gear having its peripheral portion bent over to form an open channel, with the teeth thereof formed in said bent over portion, in combination with a split ring seated within said channel and arranged to take the contact of the end surfaces of the teeth of an intermeshing gear.

4. A gear having its peripheral portion bent over to form an open channel, with the teeth thereof formed in said bent over portion, in combmation with a split ring seated within said channel and arranged to take the contact of the end surfaces of the teeth of an intermeshing gear and means for retaining said split ring in place within said channel.

5. A gear having its perpheral portion bent over to form an open sided channel and having its teeth formed in the bent over portion, in combination With a yielding body located within said channel, a spring ring devce for retaining said yielding body in position, the split ends of the retaining ring being bent or deflected.

6. The combination with a gear having a channel or groove at the bases of its teeth which communicates with the spaces' between the teeth, of a yielding body mounted in said channel or groove, and arranged to take the end thrust hearing of the teeth of an intermeshing gear and means for retaining said yielding body in place within said channel or groove.

ln testimony whereof l have hereunto set my hand in the presence of thesubscribing witnesses, on this lth day of August A. D.,

ADDI BENJAMIN CADMAN. witnesses:

C. H. WARNER, T. J. BURN& 

